package metamanagement

import (
	"context"
	"fmt"

	"git.x2erp.com/qdy/go-base/ctx"
	"git.x2erp.com/qdy/go-base/logger"
	"git.x2erp.com/qdy/go-base/model/request/queryreq"
	"git.x2erp.com/qdy/go-base/model/response"
	"git.x2erp.com/qdy/go-base/util"
	"git.x2erp.com/qdy/go-db/factory/database"
	"git.x2erp.com/qdy/go-svc-configure/internal/tables"
)

// ConfigMetaQueryRequest 配置元信息查询请求
// 嵌入通用的QueryRequest，同时保持向后兼容的旧字段
type ConfigMetaQueryRequest struct {
	queryreq.QueryRequest // 通用查询请求（分页、排序、筛选）

	// 向后兼容的旧字段（新客户端应使用QueryRequest中的Filters）
	ConfigName string `json:"configName,omitempty" form:"configName"` // 配置名称模糊搜索
	FieldName  string `json:"fieldName,omitempty" form:"fieldName"`   // 字段名称模糊搜索
	YamlName   string `json:"yamlName,omitempty" form:"yamlName"`     // YAML标签模糊搜索
	SortField  string `json:"sortField,omitempty" form:"sortField"`   // 排序字段（单字段）
	SortOrder  string `json:"sortOrder,omitempty" form:"sortOrder"`   // 排序方向: asc/desc
}

// ListConfigMeta 查询配置元信息列表（支持分页、搜索、排序）
func ListConfigMeta(req *ConfigMetaQueryRequest, ctx context.Context, dbFactory *database.DBFactory, reqCtx *ctx.RequestContext) *response.QueryResult[[]tables.ConfigMetaDB] {
	if logger.IsDebug() {
		logger.Debug("req: %v", req)
	}
	// 检查请求参数是否为nil
	if req == nil {
		logger.ErrorC(reqCtx, "ListConfigMeta请求参数为nil，创建默认参数")
		req = &ConfigMetaQueryRequest{}
		req.Page = 0
		req.PageSize = 10
	}

	// 验证和规范化请求参数
	req.Validate()

	// 将旧字段转换为新的Filters和Sorts（向后兼容）
	convertLegacyFields(req)

	logger.Debug(fmt.Sprintf("ListConfigMeta-开始查询配置元信息，参数: page=%d, pageSize=%d, filters=%d, sorts=%d, legacyFields=[configName=%s, fieldName=%s, yamlName=%s]",
		req.Page, req.PageSize, len(req.Filter), len(req.Filter), req.ConfigName, req.FieldName, req.YamlName))

	// 获取数据库连接
	db := dbFactory.GetDB()

	// 定义字段映射函数：前端字段名 -> 数据库列名
	fieldMapper := func(field string) string {
		switch field {
		case "id":
			return "id"
		case "configName":
			return "config_name"
		case "fieldName":
			return "field_name"
		case "fieldType":
			return "field_type"
		case "yamlName":
			return "yaml_name"
		case "fieldDesc", "configDesc": // 支持两种命名
			return "field_desc"
		case "creator":
			return "creator"
		case "createdAt":
			return "created_at"
		default:
			// 未知字段，返回空字符串（将被忽略）
			return ""
		}
	}

	// 使用通用查询构建器构建SQL
	whereClause, whereArgs := queryreq.BuildWhereClause(req.Filter, fieldMapper)
	orderByClause := queryreq.BuildOrderByClause(req.Sort, fieldMapper)

	// 构建基础查询
	baseQuery := `
		SELECT id, config_name, field_name, field_type, yaml_name, field_desc, creator, created_at
		FROM config_meta
	`

	// 构建计数查询
	countQuery := "SELECT COUNT(*) FROM config_meta"
	if whereClause != "" {
		countQuery += " " + whereClause
	}

	// 构建数据查询
	dataQuery := baseQuery
	if whereClause != "" {
		dataQuery += " " + whereClause
	}
	if orderByClause != "" {
		dataQuery += " " + orderByClause
	} else {
		// 默认排序
		dataQuery += " ORDER BY config_name, field_name"
	}

	// 添加分页限制
	dataQuery += " LIMIT ? OFFSET ?"
	queryArgs := append(whereArgs, req.PageSize, req.GetOffset())

	// 查询总记录数
	var totalCount int64
	err := db.GetContext(ctx, &totalCount, countQuery, whereArgs...)
	if err != nil {
		logger.ErrorC(reqCtx, fmt.Sprintf("查询配置元信息总数失败: %v", err))
		return util.CreateErrorResult[[]tables.ConfigMetaDB](fmt.Sprintf("查询配置元信息总数失败: %v", err), reqCtx)
	}

	// 查询分页数据
	var metaList []tables.ConfigMetaDB
	err = db.SelectContext(ctx, &metaList, dataQuery, queryArgs...)
	if err != nil {
		logger.ErrorC(reqCtx, fmt.Sprintf("查询配置元信息失败: %v", err))
		return util.CreateErrorResult[[]tables.ConfigMetaDB](fmt.Sprintf("查询配置元信息失败: %v", err), reqCtx)
	}

	logger.Debug(fmt.Sprintf("查询到 %d 条配置元信息，总记录数: %d", len(metaList), totalCount))

	// 创建结果，设置TotalCount
	result := util.CreateSuccessResultData[[]tables.ConfigMetaDB](metaList, reqCtx)
	result.TotalCount = int(totalCount)

	// 计算总页数
	pageSize := req.PageSize
	if pageSize <= 0 {
		pageSize = 10 // 默认每页10条
	}
	lastPage := 1
	if pageSize > 0 && totalCount > 0 {
		lastPage = (int(totalCount) + pageSize - 1) / pageSize
	}
	result.LastPage = lastPage

	logger.Debug(fmt.Sprintf("设置QueryResult TotalCount: %d, LastPage: %d", result.TotalCount, result.LastPage))
	return result
}

// convertLegacyFields 将旧字段转换为新的Filters和Sorts（向后兼容）
func convertLegacyFields(req *ConfigMetaQueryRequest) {
	// 转换旧搜索字段为Filters
	if req.ConfigName != "" {
		req.Filter = append(req.Filter, queryreq.FilterParam{
			Field:    "configName",
			Operator: queryreq.OpLike,
			Value:    req.ConfigName,
		})
	}
	if req.FieldName != "" {
		req.Filter = append(req.Filter, queryreq.FilterParam{
			Field:    "fieldName",
			Operator: queryreq.OpLike,
			Value:    req.FieldName,
		})
	}
	if req.YamlName != "" {
		req.Filter = append(req.Filter, queryreq.FilterParam{
			Field:    "yamlName",
			Operator: queryreq.OpLike,
			Value:    req.YamlName,
		})
	}

	// 转换旧排序字段为Sorts
	if req.SortField != "" {
		// 映射可能的旧字段名
		sortField := req.SortField
		switch sortField {
		case "config_name":
			sortField = "configName"
		case "field_name":
			sortField = "fieldName"
		case "field_type":
			sortField = "fieldType"
		case "yaml_name":
			sortField = "yamlName"
		case "field_desc":
			sortField = "fieldDesc"
		case "created_at":
			sortField = "createdAt"
		}

		sortOrder := req.SortOrder
		if sortOrder != "asc" && sortOrder != "desc" {
			sortOrder = "asc"
		}

		req.Sort = append(req.Sort, queryreq.SortParam{
			Field: sortField,
			Order: sortOrder,
		})
	}
}

// SearchConfigMeta 搜索配置元信息
func SearchConfigMeta(ctx context.Context, dbFactory *database.DBFactory, configName, fieldName, yamlName string, reqCtx *ctx.RequestContext) *response.QueryResult[[]tables.ConfigMetaDB] {
	logger.Debug("SearchConfigMeta-开始搜索配置元信息")

	// 获取数据库连接
	db := dbFactory.GetDB()

	// 构建查询条件和参数
	query := `
		SELECT id, config_name, field_name, field_type, yaml_name, field_desc, creator, created_at
		FROM config_meta 
		WHERE 1=1
	`
	var args []interface{}

	if configName != "" {
		query += " AND config_name LIKE ?"
		args = append(args, "%"+configName+"%")
	}
	if fieldName != "" {
		query += " AND field_name LIKE ?"
		args = append(args, "%"+fieldName+"%")
	}
	if yamlName != "" {
		query += " AND yaml_name LIKE ?"
		args = append(args, "%"+yamlName+"%")
	}

	query += " ORDER BY config_name, field_name"

	var metaList []tables.ConfigMetaDB
	err := db.SelectContext(ctx, &metaList, query, args...)
	if err != nil {
		logger.ErrorC(reqCtx, fmt.Sprintf("搜索配置元信息失败: %v", err))
		return util.CreateErrorResult[[]tables.ConfigMetaDB](fmt.Sprintf("搜索配置元信息失败: %v", err), reqCtx)
	}

	logger.Debug(fmt.Sprintf("搜索到 %d 条配置元信息", len(metaList)))
	return util.CreateSuccessResultData[[]tables.ConfigMetaDB](metaList, reqCtx)
}